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What is a rem file and how do I open a rem file?

An REM file is stored on a BlackBerry smartphone. It may be one of several different file types, but the REM extension indicates the file has been encrypted. It often has a compound file extension like .jpg.rem, which is an encrypted JPEG image file. REM files can only be decrypted on a BlackBerry phone. They may be transferred to a computer using RIM software, but cannot be opened directly on a Mac or PC.